Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.67 (12 reviews)

Find affordable NN1 extension builders now

Extension builders rates in NN1 range from £24/hour £176/day (A G Hicks Building Services) to £44/hour £281/day (Samrai Associates Limited). To see prices and availability now for your job click green button.

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"Loft extension (dormer)" - NN5, job posted 21/08/26

"Granny annexe" - NN5, job posted 04/08/26

"I need a quote for a second-floor extension sized 3m x 3.5m. Work includes structure, walls, insulation, roof, windows, and basic internal finishing, plus connection to the existing house. Please confirm: Total cos with my material and if with your material Time to complet and when you can..." - NORTHAMPTON, job posted 19/11/25

"Side return extension" - NORTHAMPTON, job posted 03/06/25

"Loft conversion" - NORTHAMPTON, job posted 29/01/25

"Loft conversion" - NORTHAMPTON, job posted 10/01/25

"Loft conversion, 2 beds dormer" - NORTHAMPTON, job posted 23/11/24

"Dormer Loft conversion" - NORTHAMPTON, job posted 02/04/24

"Loft conversion" - NORTHAMPTON, job posted 24/03/24

"Basement conversion" - NORTHAMPTON, job posted 13/02/24

"Loft conversion" - NORTHAMPTON, job posted 30/10/23

"Loft conversion" - NORTHAMPTON, job posted 02/09/23

Compare NN1 extension builders rates

Compare NN1 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Northampton	£35	£239
Extension Builders near Wellingborough	£39	£251
Extension Builders near Daventry	£31	£230
Extension Builders near Rushden	£34	£231
Extension Builders near Kettering	£34	£237
Extension Builders near Milton Keynes	£39	£263
Extension Builders near Market Harborough	£31	£217
Extension Builders near Rugby	£31	£224
Extension Builders near Bletchley	£39	£265
Extension Builders near South Bedfordshire	£45	£278

Job estimates from extension builders near you

Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Build a timber frame extension - £25,872

Garden office - £9,872

Granny annexe - £86,872

Build a flat roof extension - £21,872

Convert a Garage - £15,872

Hip to gable loft conversion - £41,872

Convert a bungalow loft - £28,872

Build a dormer loft conversion - £41,872

Build a swimming pool - £80,872

Build a Mansard loft conversion - £51,872

Concrete foundations - £6,122

Underpin a building - £17,372

Two storey extension - £87,808

Convert a basement - £36,060

Side return extension - £40,060

Loft conversion - £32,550

Garage - £18,372

Single storey extension - £52,440

Outbuilding - £9,872

Install an RSJ - £2,072

Build a kitchen extension - £41,872

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